Since "Junior"(85 300TD) is running so perfectly now, and I have only a couple things to do to wife's SD, I was driving to work in the dark this morning and noticed the fan high/low/auto switches were dark, although
every other choice was lighted. I don't want to take the dash apart of course
to fix something that may be normal. So at night are your white auto/high/low buttons lighted? Do I have an "occupation" tomorrow.

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85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson

Sounds like a failed bulb. Pretty easy fix.

the ccu takes 4 or 5 of them lil' tiny bulbs- 1.2watt, I believe. there is on on the fan swityches, one on the wheel, and then 2? on the push buttons.

but if your worried about the bulbs in the ccu, your OCD may be getting you

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1984 123.193 372,xxx miles, room for Seven.

1999 Dodge Durango Cummins 4BTAA 47RE 5k lb 4x4 getting 25+mpgs, room for Seven.

I replaced that bulb a minute ago. Actually just went ahead and replaced
them all. The sockets were a bit heat deformed and the one on the wheel
had the holder ears snapped off, so I put a little drop of glue on the holder.
Did the job in about 10 minutes. 2.45 for the bulbs.

__________________
85 300TD FED-Daily
84 300SD-Wife's
86 XJS-Sunday
66 GMC-Work- Given to my stepson
83 BMW Airhead- Given to my stepson